12 Days of Christmas
79
99 Bottles of Beer
241
Abundant Numbers
217
Christmas Trees
86
Cubes
35
Diamonds
43
Divisors
27
Emirp Numbers
247
Evil Numbers
320
Fibonacci
622
Fizz Buzz
316
Happy Numbers
293
Leap Years
640
Niven Numbers
282
Odious Numbers
Pascal’s Triangle
48
Pernicious Numbers
203
Prime Numbers
352
Rule 110
6
Sierpiński Triangle
116
United States
101
λ
106
π
50
τ
50
φ
44
√2
46
𝑒
38